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package com.memberwebs.ldapxml.helpers;
import java.util.*;
import org.w3c.dom.*;
/**
* Used to sort XML elements according to a specified sort order
*
* @author nielsen@memberwebs.com
* @version 0.5
*/
public class LXComparator
implements Comparator
{
/**
* Construct a new LXComparator
*
* @param attrs The element or attribute names to sort by
* @param directions The sort direction for each attr
*/
public LXComparator(String[] attrs, boolean[] directions)
{
m_attrs = attrs;
m_directions = directions;
}
/**
* Compare two objects and return -1, 0 or 1
*
* @param o1 The first object
* @param o2 The second object
*/
public int compare(Object o1, Object o2)
{
Element e1 = (Element)o1;
Element e2 = (Element)o2;
for(int i = 0; i < m_attrs.length; i++)
{
String v1 = getSubElementValue(e1, m_attrs[i]);
String v2 = getSubElementValue(e2, m_attrs[i]);
int ret;
if(v1 == null && v2 == null)
ret = 0;
else if(v1 == null)
ret = -1;
else if(v2 == null)
ret = 1;
else
ret = v1.compareTo(v2);
if(ret != 0)
return m_directions[i] ? ret : -ret;
}
return 0;
}
/**
* Check whether another comparator is equal to this one.
*
* @param obj The other comparator
* @return Whether equal or not
*/
public boolean equals(Object obj)
{
LXComparator other = (LXComparator)obj;
return m_attrs.equals(other.m_attrs) &&
m_directions.equals(other.m_directions);
}
/**
* Get a value from an element. The value is either retrieved
* from a sub element of the appropriate name or an attribute
* of the same name.
*
* @param el The element to retrieve from.
* @param attr The value name
*/
private static String getSubElementValue(Element el, String attr)
{
// First we search sub elements and then attributes
if(el.hasChildNodes())
{
NodeList children = el.getChildNodes();
for(int i = 0; i < children.getLength(); i++)
{
Node child = children.item(i);
if(child != null &&
child.getNodeType() == Node.ELEMENT_NODE &&
child.getNodeName().equals(attr))
{
return getElementValue(el);
}
}
}
// Otherwise try to get the attribute by the same name
return el.getAttribute(attr);
}
/**
* Get the complete text value of an element.
*
* @param el The element to retrieve value for
* @return The value.
*/
private static String getElementValue(Element el)
{
String value = "";
if(el.hasChildNodes())
{
NodeList children = el.getChildNodes();
for(int i = 0; i < children.getLength(); i++)
{
Node child = children.item(i);
if(child != null)
{
switch(child.getNodeType())
{
case Node.ELEMENT_NODE:
value += getElementValue((Element)child);
break;
case Node.TEXT_NODE:
value += child.getNodeValue();
break;
}
}
}
}
return value;
}
private String[] m_attrs;
private boolean[] m_directions;
}
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